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Dossier · Vulnerability

Actively exploited · CISA KEV · NVD published 2026-01-05

CVE-2025-66376

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

Signals

Exploited in the wild
Yesadded 2026-03-18 · due 2026-04-01. An observation, not a forecast.
EPSS · 30-day forecast
20%Chance of exploitation in the next 30 days, 97th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · HIGH
7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Internet exposure
not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

not checked

Not checked yet. Our exploit watch has not looked at this CVE, so this says nothing either way.

On the wire

1 dispatch
  1. 5 months …APT

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